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<div class="moz-cite-prefix">Please keep the discussion on the list.<br>
<br>
vtkDistanceWidget with the default representation also uses
sqrt(vtkMath::Distance2BetweenPoints(p1,p2)). Did you check your
points coordinates? Can you provide the rest of your code?<br>
<br>
On 09.08.2012 19:48, Concetta Piazzese wrote:<br>
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<div dir="ltr">
Yeah, I considered that. But I still got wrong numbers. When the
user places a seed, the vtkSeedCallback stores the point world
position
(this->SeedRepresentation->GetSeedWorldPosition(i, pos);).
Do you know how vtkDistanceWidget computes distance in
millimeters? <br>
<br>
<div>
<hr id="stopSpelling">Date: Thu, 9 Aug 2012 19:25:48 +0200<br>
From: <a class="moz-txt-link-abbreviated" href="mailto:dominique@toepfer-web.de">dominique@toepfer-web.de</a><br>
To: <a class="moz-txt-link-abbreviated" href="mailto:aliens30586@hotmail.it">aliens30586@hotmail.it</a>; <a class="moz-txt-link-abbreviated" href="mailto:vtkusers@vtk.org">vtkusers@vtk.org</a><br>
Subject: Re: [vtkusers] Distance between 2 points in
millimeters (mm)<br>
<br>
<div class="ecxmoz-cite-prefix">I agree, the loop should work
now. But then the error seems to be in Seed(). Is it
possible, that the order of points provided by the user is
different from the order in your vtkPoints object? Did you
consider the image spacing?<br>
<br>
On 09.08.2012 18:52, Concetta Piazzese wrote:<br>
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<div dir="ltr"> You're right but the problem isn't fixed. I
still got wrong distances. The loop was wrong but I think
the problem is not in the loop. Now the loop is:<br>
for (int i=0; i<num; i++)<br>
{ <br>
points->GetPoint(i,punto);<br>
points->GetPoint(i+1,punto2);<br>
<br>
double squaredDistance;<br>
double dist;<br>
<br>
// Distance<br>
squaredDistance =
vtkMath::Distance2BetweenPoints(punto, punto2);<br>
dist=sqrt(squaredDistance);<br>
<br>
std::cout << "Distance " << dist <<
std::endl;<br>
<br>
}<br>
<br>
<div>
<hr id="ecxstopSpelling">Date: Thu, 9 Aug 2012 18:47:08
+0200<br>
From: <a moz-do-not-send="true"
class="ecxmoz-txt-link-abbreviated"
href="mailto:dominique@toepfer-web.de">dominique@toepfer-web.de</a><br>
To: <a moz-do-not-send="true"
class="ecxmoz-txt-link-abbreviated"
href="mailto:aliens30586@hotmail.it">aliens30586@hotmail.it</a><br>
CC: <a moz-do-not-send="true"
class="ecxmoz-txt-link-abbreviated"
href="mailto:vtkusers@vtk.org">vtkusers@vtk.org</a><br>
Subject: Re: [vtkusers] Distance between 2 points in
millimeters (mm)<br>
<br>
<div class="ecxmoz-cite-prefix">Hi,<br>
<br>
I think these lines in the for-loop are wrong:<br>
<br>
points->GetPoint(num-1,punto);<br>
points->GetPoint(num,punto2);<br>
<br>
You seem to calculate the distance between the same
two points in every iteration. You need to use i
instead of num here.<br>
<br>
Regards,<br>
Dominique<br>
<br>
<br>
On 09.08.2012 18:34, Concetta Piazzese wrote:<br>
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<div dir="ltr"> Hy everyone. I hope somebody can help
me!<br>
I need to find the distance between 2 points in
millimeters like the vtkDistanceWidget does. An user
places 10 points and then the program compute the
distances. The problem is that I have an array of
vtkPoints and I can't use vtkDistanceWidget to find
the distances. How I can find the distance? The
points positions are inglobal coordinate values. The
distance I got are totally wrong. Here is my code: <br>
<br>
int main(int argc, char *argv[])<br>
{<br>
reader->SetFileName("C:/Tesi/DistanceBetween2Points_build/Debug/Data/Plaque_08.mhd");<br>
reader->Update(); <br>
<br>
imgconn=reader->GetOutput();<br>
<br>
//Points Placement with vtkSeedWidget. Poins are
stored in a vtkPoints called "points"<br>
Seed();<br>
<br>
double punto[3];<br>
double punto2[3];<br>
<br>
int num=points->GetNumberOfPoints();<br>
<br>
for (int i=0; i<num; i++)<br>
{ <br>
points->GetPoint(num-1,punto);<br>
points->GetPoint(num,punto2);<br>
<br>
double squaredDistance;<br>
double dist;<br>
<br>
// Distance<br>
squaredDistance =
vtkMath::Distance2BetweenPoints(punto, punto2);<br>
dist=sqrt(squaredDistance);<br>
<br>
std::cout << "Distance " << dist
<< std::endl;<br>
<br>
}<br>
<br>
return EXIT_SUCCESS;<br>
}<br>
<br>
What's the problem? vtkDistanceWidget computes
distances using vtkMath::Distance2BetweenPoints. So
what am I doing wrong?<br>
Thank you!<br>
</div>
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<br>
<br>
<pre class="ecxmoz-signature">--
Dominique Töpfer, Dipl.-Inform.
Institute of Medical Physics
University of Erlangen</pre>
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</blockquote>
<br>
<br>
<pre class="ecxmoz-signature">--
Dominique Töpfer, Dipl.-Inform.
Institute of Medical Physics
University of Erlangen</pre>
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</blockquote>
<br>
<br>
<pre class="moz-signature" cols="72">--
Dominique Töpfer, Dipl.-Inform.
Institute of Medical Physics
University of Erlangen</pre>
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